DPKG Installation Tools (Demo)
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Video Transcription
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>> Hey, Cybrarians.
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>> Welcome back to
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>> the Linux plus course here at Cybrary.
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I'm your instructor Rob Goelz.
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In today's lesson, we're going to discuss using
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dpkg tools to install DEB packages.
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Upon completion of today's lesson,
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you're going to understand how to use
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the dpkg command to work with Debian or deb files.
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We're also going to use apt, apt-get,
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and apt-cache to work with Debian files
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and we're going to work with the Graphical Aptitude tool.
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Now, a brief overview on
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these three types of package managers;
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dpkg is the command line tool that's used to
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manage DEB packages in Debian-based distros,
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so that's going to be something like Ubuntu.
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Apt-get is a package manager that is used, apt-get,
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think of it in the place of
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Yammer or DNF when you're talking about Debian and dpkg,
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you can think of it in the place of
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RPM when you're talking about Debian.
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Then finally, aptitude is a half text-based,
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half graphical package manager and
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it works just like apt-get to install packages.
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Let's take a look at these with some demo time.
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[NOISE] Here we are
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in a Ubuntu environment
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and the first thing we're going to do is just
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become root for just
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making things move a little bit quicker and let's
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actually cd to the root home directory
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and do a list in here.
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We can do, and I'll ask them to see that we have
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apache 2 and pigeon.
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Like RPN, dpkg doesn't install package dependencies,
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if we do a dpkg dash i 4 install on apache 2,
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sorry, we're going to actually need
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to specify the entire name.
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I'm going to dot slash this,
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let me put a dot slash in front of
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it and we'll go like this.
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There we are. What do we see?
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Just like we saw with RPM,
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it says we have dependency problems that
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prevent configuration of apache 2,
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we would need to download these other packages like
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apache 2 ban and utils
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the data in order to install apache.
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But let's do it clear here and let's try and do
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a dpkg installed on pigeon,
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which we also have in this directory and if we hit Enter,
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then it's going to install properly because all of
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the dependencies have been met and it's not an issue.
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Now, just like what we saw with yum and D and F,
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we can get information on the packages installed.
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We could do that with dpkg dash capital
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I and we'll do that for pigeon.
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That tells us about the debian package, the name,
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the version and the architecture
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and then also down here it's going to tell
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us all about the description of
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the package that we just installed.
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If we wanted to see all the files
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that got installed with pigeon,
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we could do a dpkg space, capital L,
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dash capital L, and the common
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pigeon and we can
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see all the files that got
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installed along with the package.
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Finally, if we wanted to remove the package,
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we could a dpkg dash R for remove on pigeon
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[NOISE] and we can see that the package
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actually got removed and all of
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the other things that had its dependencies removed.
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Now we can check and see that it's removed by doing
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[inaudible] and it says that it's not there.
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We can actually try and do in Oregon to remove
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once more and it'll say it's not installed.
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That's how we can tell that that's not installed,
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but that's all we really need to know
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about using a dpkg command.
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Let's move on and look at apt.
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Now the apt or apt-get tool can be
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used to install packages and their dependencies.
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Like we saw before, we can install apache 2,
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we can do that here,
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but let's do this first.
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Anytime you're working with apt or apt-get,
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the first thing that you want to do is run an update.
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Now this isn't going to actually update
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installing packages on the system,
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really all it does is it goes out through the repository,
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is reads the package list and make sure that you
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have the most up-to-date information
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for apt so that it can
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make good decisions about what needs to be installed.
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Understand what packages are out there and what
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dependencies are needed to make things happen.
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Where we couldn't install apache 2 before,
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let's try and just do an app
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installed on apache 2 and see what happens.
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Now, we can see that,
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I apologize, because we
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tried to install this with DNF and it broke.
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It didn't actually work properly.
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Let me show you another command will do
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an app purge on apache
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2 and this will remove anything that we don't
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need that got stuck out there in the system.
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This is just coming up because we tried to do that
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dpkg install on apache 2 and it failed.
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Let's clear our screen and now we'll do
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an app install apache
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2 and now we can see that it can be installed.
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We can hit Y to continue
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and it's going to pull down and install
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everything we needed and now
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apache will be installed on the system.
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If we want to see the information about the package,
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about what got installed,
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we can use a command called app cache.
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Let me clear the screen and we'll run app cache
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[LAUGHTER] show apache 2.
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This will show us all the information about the package.
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It'll show us the architecture,
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the description and so on and so forth.
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Just like we saw with young men authority and FIFO.
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But here we use app cache
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and then the name of the package.
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If we wanted to see all of the installed packages,
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what you can do is run
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the command, lets clear our screen.
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At cache pkg names.
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This will show us all the packages that are installed.
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Now if we wanted to uninstall
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the HTTP package that we just installed,
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we can actually just do an apt remove apache 2.
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Clear our screen and
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this will tell us that it's going to remove
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everything we had installed then hit y to do that
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[NOISE] and it will remove everything.
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It'll actually update a firewall profile here
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for Engine X HTTP as well.
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Let's go ahead and do a search for
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our favorite other package which is pigeons.
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We do an app search for
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pigeon [NOISE] and that
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will tell us if it's out there and yeah,
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it's out there and there's
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quite a bit of stuff out there.
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We can find pigeon, that's no problem.
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If we wanted to update all packages,
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we can do an app upgrade.
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We can actually run this and it'll
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tell us what packages there are to update.
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Let's just go ahead and hit Run on
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that and we can see that it will
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install 424 megabytes of
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additional disk space on the system.
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Just like we saw with CentOS and
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the previous lesson or lessons,
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I have a little bit of updating
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to do, but we're not going to do that.
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We're just going to move forward, we're going to hit
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end to stop that and
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the other thing that we can do in apt
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is we can actually do an app clean,
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this is just like a young clean all.
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This will just clean up a system and
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make sure that everything is
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nice and clean and ready to go.
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[NOISE] Let's clear our screen
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here and move on to our last command,
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the aptitude tool, which provides
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text-based interactive package management.
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Here's the aptitude and
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we see it's going to load the cache here and is
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going to provide us with a menu.
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If we wanted to and say install apache 2,
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what we can do is we can arrow down to not
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install packages and then we can
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go all the way down here to
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the WBS and we find web and hit Enter on it.
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We go to mean and then we would try and find apache
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2 somewhere in here if we needed to install it.
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Now installed packages and scroll down
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web, there is apache 2.
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We could click the Plus button
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if we wanted to install it.
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And there we go, and then if
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we want to install it, once we've installed that,
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we can type the G and it'll install it generally,
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although we would have to do
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a purging end because it's being a
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little funky with us, but that's how you do it.
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After the install completes,
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you'd hit Return and this will
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bring us back into aptitude.
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Move or navigate to the same place.
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You can go back into install packages.
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Let's actually just hit,
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I'll say Q up here to
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get back to where we were and we'll quit aptitude.
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Let's go back in and
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then what we can do is we can go into install packages.
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Then we can go down to
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our web and we can search mean for apache.
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Now, it didn't actually get installed
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because we had some problems with it,
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but if we wanted to remove it here,
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we can type minus,
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then hit G and it would remove the program.
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But we're just going to go ahead and quit out of it.
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We just want to show you a little bit of an overview
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of aptitude there and that's
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really all you need to know about aptitude,
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apt and dpkg.
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[NOISE] With that, we've reached
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the end of the lesson and in this lesson we covered
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the dpkg command for installing individual that packages.
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We also work with apt,
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apt- get and apt- cache for installing
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deb packages and doing package management,
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and we got a little bit of an overview of the aptitude,
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text-based GUI package management tool.
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Thanks so much for being here and I look
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forward to seeing you in the next lesson.
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